/*
 * ============================================================================
 *                   GNU Lesser General Public License
 * ============================================================================
 *
 *
 *
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 *
 *
 */
package rad.framework.validator;

import java.io.Serializable;

import rad.framework.el.Context;
import rad.framework.el.ExpressionUtil;

import org.hibernate.validator.Validator;

/**
 * @author boudyacho
 */
public class ExpressionValidator implements Validator<Expression>, Serializable {
	private static final long serialVersionUID = 1L;

	private String expression;

	public void initialize(Expression expression) {
		this.expression = expression.value();
	}

	public boolean isValid(Object value) {
		if (value == null) {
			return true;
		} else {
			return evaluate(value);
		}
	}

	protected boolean evaluate(Object value) {
		Context context = new Context();
		context.put("value", value);
		return ExpressionUtil.getValue(context, format(expression),
				Boolean.class);
	}

	protected String format(final String exp) {
		if (!exp.contains("#{")) {
			return "#{" + exp + "}";
		} else {
			return exp;
		}
	}
}
